Interface AsyncMultiMap<K,V>

public interface AsyncMultiMap<K,V>

An asynchronous multi-map.
A multi-map holds a Set of values against each key as opposed to a single value, as with a Map. A value appears only
once for a key (no duplicated values for the same key).
The cluster implementation should ensure that any entries placed in the map from any node are available on any
node of the cluster.